Concept Design Using Topology and Topography Optimization

Chapter 2: Topology Optimization of an Automotive Control Arm12. Click assign.Have most of your elements converged to a density close to 1 or 0?If there are many elements with intermediate densities, you may need to adjust thediscrete parameter. The DISCRETE parameter (set in the opti control panel) canbe used to push elements with intermediate densities towards 1 or 0 so that a morediscrete structure is given.In this model, refining the mesh should provide a more discrete solution; however, forthe sake of this tutorial, the current mesh and results will be sufficient.Regions that need reinforcement will tend towards a density of 1.0. Areas that donot need reinforcement will tend towards a density of 0.0.Is the max= field showing 1.0e+00?In this case, it is.If it is not, your optimization has not progressed far enough. Allow more iterationsand/or decrease the OBJTOL parameter (set in the control cards panel).If adjusting your discrete parameter, refining the mesh, and/or decreasing theobjective tolerance does not yield a more discrete solution (none of the elementsprogress to a density value of 1.0), you may wish to review the setup of theoptimization problem. Perhaps some of the defined constraints are not attainable forthe given objective function (or visa-versa).44Concept Design Using Topology and Topography Optimization OptiStruct 7.0Proprietary Information of Altair Engineering, Inc.